Yellow Leaves on citrus
What's Happening
Indoor citrus yellow leaves result from multiple interconnected stressors: overwatering-induced root rot (soil saturation >7 days creates anaerobic conditions), underwatering (soil pulling away from pot edges), nitrogen deficiency (older leaves yellow while veins stay green), iron/magnesium deficiency from alkaline soil pH >7.5 causing interveinal chlorosis on new leaves, insufficient light (<8 hours daily triggers energy depletion), and pest stress from spider mites, scale, or aphids.
How to Fix It
- 1
Check soil moisture: If soggy, unpot and inspect roots—trim black/mushy roots, repot in well-draining mix
- 2
For nitrogen deficiency: Apply balanced citrus fertilizer (N-P-K 2-1-1 ratio) every 4-6 weeks during spring-summer
- 3
For iron/magnesium chlorosis: Apply chelated iron or Epsom salts; test soil pH and adjust with sulfur if >7.0
- 4
Increase light exposure: Move to south-facing window or supplement with grow lights for 12-14 hours
- 5
Treat pests: Wipe leaves with neem oil or insecticidal soap; isolate affected plants immediately
How to Prevent It
Use finger test: water only when top 2-3 inches are dry. Maintain 8+ hours bright direct light. Use citrus-specific fertilizer with micronutrients during growing season. Keep soil pH 6.0-6.5. Flush soil quarterly to prevent salt buildup. Inspect leaves weekly for pests.